植物の多様性が土壌呼吸に与える肯定的な影響は,世界の森林における生産性の増加に伴い,減少する
Benjamin Laffitte1,2,3, Zhihan Yang4, Jinshi Jian5
1State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, China.
Nature communications
|February 21, 2026
まとめ
植物の多様性により,生産性が低い森林では土壌呼吸が促進されます. しかし,この効果は高生産性の森林では減少し,生物多様性を示しています.
科学分野:
- エコロジー エコロジー エコロジー
- グローバル・チェンジ 生物学 生物学
- 土壌科学 土壌科学
背景:
- 植物の多様性は,炭素循環を含む生態系機能にとって極めて重要です.
- 植物多様性と土壌呼吸の間の世界的な関係については,十分に理解されていません.
- この関係を理解することは,炭素-気候フィードバックの予測に不可欠です.
研究 の 目的:
- 植物種の豊かさと土壌呼吸の間の地球規模の関係を調査する.
- 植物の多様性が,異なる森林の生産性グラデーションにおける土壌呼吸にどのように影響するかを決定する.
- 土壌の炭素の流れを規制する生物多様性の文脈に依存する役割を明らかにする.
主な方法:
- 統合されたグローバル植物種豊かさデータセット (樹木と血管性植物).
- 6355のフィールド観測で訓練されたディープラーニングモデルを使用して,地球規模の土壌呼吸を推定しました.
- 構造方程式モデリングを用いて,純一次生産で層分化したデータを分析し,共変数を制御した.
主要な成果:
- 植物の多様性は,生産性が低いから中程度の森林 (<1300 g C m-2 yr-1) で土壌呼吸を高める.
- 植物の多様性が土壌呼吸に与える肯定的な影響は,高生産性の森林では減少する.
- 生物多様性は,資源が限られたシステムにおける土壌呼吸を増幅しますが,非生物的要因が支配する高生産性の森林では,その役割は最小限です.
結論:
- 土壌呼吸を調節する植物生物多様性の役割は文脈に依存し,森林の生産性によって異なります.
- 生物多様性は土壌の炭素の流れに影響を与え,生産性が低い生態系ではより強い影響を与える.
- 生物多様性が,生産性のグラデーションを越えて生態系の炭素ダイナミクスをどのように形作るかについての洞察を提供します.
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